121352731 has 4 divisors (see below), whose sum is σ = 123934752. Its totient is φ = 118770712.

The previous prime is 121352719. The next prime is 121352741. The reversal of 121352731 is 137253121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121352731 - 2¹⁹ = 120828443 is a prime.

It is a super-2 number, since 2×121352731² = 29452970642316722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121352696 and 121352705.

It is not an unprimeable number, because it can be changed into a prime (121352701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1290940 + ... + 1291033.

It is an arithmetic number, because the mean of its divisors is an integer number (30983688).

Almost surely, 2^121352731 is an apocalyptic number.

121352731 is a deficient number, since it is larger than the sum of its proper divisors (2582021).

121352731 is an equidigital number, since it uses as much as digits as its factorization.

121352731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2582020.

The product of its digits is 1260, while the sum is 25.

The square root of 121352731 is about 11016.0215595286. The cubic root of 121352731 is about 495.0888946902.

The spelling of 121352731 in words is "one hundred twenty-one million, three hundred fifty-two thousand, seven hundred thirty-one".